The mass of potassium chloride, KCl needed to make the solution is 148 g
How to determine the mass of KCl
We'll begin by obtaining the mole of KCl. This can be obtained as follow:
- Volume = 0.5 L
- Molarity = 4 M
- Mole of KCl =?
Molarity = mole / volume
Cross multiply
Mole = Molarity x Volume
Mole of KCl = 4 × 0.5
Mole of KCl = 2 moles
Finally, we shall determine the mass of KCl
- Molar mass of KCl = 39 + 35 = 74 g/mol
- Mole of KCl = 2 moles
- Mass of KCl =?
Mole = mass / molar mass
Cross multiply
Mass = mole × molar mass
Mass of KCl = 2 × 74
Mass of KCl = 148 g
Thus, the mass of KCl is 148 g148 g
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